Auxiliary spark ignition apparatus



y ,1946. i 1. VJ. HYULBERT 2,400,757

AUXILIARY SPARK I GNITION APPARATUS FOR INTERNAL-COMBUSTION ENGINES Filed May 10, 1944 INVEN TOR.

fawn MM ATTORNEY Patented May-21, 194s AUXILIARY SPARK IGNITION APPARATUS FOR INTERNAL-COMBUSTION ENGINES Ivan Jack Hulbert, London, England, assignor to Rota: Limited, London, England Application May 10, 1944, Serial No. 534,923 In Great Britain February 18, 1943 6 Claims.

This invention has for its object to provide an improved auxiliary spark ignition apparatus for internal combustion engines, the apparatus being of the kind used in conjunction with a magneto for starting an engine and comprising an energising coil adapted to be connected to the primary winding of the magneto, and to be supplied with current from a battery, the coil circuit being controlled by a trembler interrupter.

The invention comprises the combination of an auxiliary energising coil and a trembler interrupter adapted to connect the coil alternately to the battery and to the magneto.

The accompanying diagram illustrates one mode of carrying the invention into effect- In the diagram a indicates a magneto having a primary winding b and a secondary winding c. Arranged across the primary winding b are the usual contact breaker dand condenser e, The secondary winding is connected to any convenlent distributor ,f whereby the high tension dis charges are supplied to the sparking plugs g of the engine.

.In carrying the inventioninto efiect as shown I employ a coil h of appropriate size, this coil being provided with an' iron core 1'. One end of I quent attraction of the 'second blade n by the shown in the diagram, the contactso, r are closed, and current can flow into the coil h from the battery s and so energise the coil. The subsemagnetic fiux in the core i causes the circuit of the magnetic primary winding b to be closed by the contactsq, p and the circuit of the battery s to be opened by the contacts 0, r, whereupon the stored energy of the coil )2. is transferred from the coil to the magneto primary winding where it serves to produce the required spark'throu-gh the 4 medium of the magneto secondary winding 0, it being understood of course, that the contact breaker d of the magneto primary winding is opened at the appropriate time. On the return or the interrupter to its initial position the cycle the magneto, I am able to effect more satisfactory operation of the auxiliary ignition means than with an ordinary trembler interrupter.

Having thus described my invention what I claim as new and desire to secure by Letters Pat- 7 ent is:

the coil h is adaptedto be connected to the earthed end of the primary winding b of the magneto a. In association with the coil his arranged a trembler interrupter 7' adapted to be actuated by the flux produced in the core i when current passes'through the coil. The interrupter 1 comprises a pair of insulated vibratory blades m, n which are arranged parallel with and adjacent to This latter contact is adapted to co-operate with.

the contact p on the first blade m, and to transmit movement to this blade from the secondblade n. Also the contact q is connected to the end oi the magneto primary winding b remote from that connected to the coil h. An adjustably mounted but otherwise fixed contact r co-operates with the other contact 0 on the first blade 1n, and is conof the battery being earthed.

With the interrupter in the limit position l 1-. An auxiliary spark ignition apparatus of the kind specified, comprising the combination 01! an auxiliary energising coil and a trembler interrupter adapted to connect the coil alternately to the battery and to the magneto.

2. An auxiliary spark ignition apparatus claimed-in claim 1, in which the trembler interrupter comprises in combination a vibratory member adapted to be connected to the coil, 9. pair of. contacts on the vibratory member, a second vibratory member responsive to the flux produced a by the coil and adapted to impart movement to 7 the flrst'vibratory member, a, third contact provided on the second vibratory member andwinding of the magneto, and a stationary contact nected to one end of the battery 8, the other end v 4 adapted to co-operate with the other contact on the first vibratory member and to be connected to the battery.

3. Auxiliary energizing means for a magneto comprising a coil, means to energize the coil, means to transmit the energy of the coil to the primary winding of a magneto, and means to connect the coil alternately to the energizing means .and' to said primary winding.

4. Auxiliary energizing means for a magneto comprising a coil and core, means to energize the transmit the energy or the coil and core to the primary winding of a magneto, and means operable by the coil and core to connect the coil alternately to the battery and to said primarywinding.

5. Auxiliary energizing means for a magneto comprising a coil, means to energize the coil comprising a battery, means to transmit the energy of the coil and core to the primary winding of a magneto, and means to connect the coil alternately to the battery and to said primary winding comprising a trembler interrupter operated by the magnetism of the coil to break the battery circuit and connect said winding to said coil.-

6. Auxiliary energizing means for a magneto comprising a battery, a coil, means to connect the coil in circuit with the battery comprising a spring arm normally tending to close a-contact in the battery circuit that directs the battery current through the coil, and means to break the circuit from the battery through the coil and to connect the coil with the primary winding of the 'magneto comprising a spring arm adapted to be displaced by the fiux'of the coil and to displace the first said spring arm, said spring arms having contacts that close the circuit from the coil to the magneto when they are so displaced.

vm JACK HULBERT. 

